using System;

using System.IO;

using System.Xml;

using System.Xml.XPath;

public class XmlReaderSample

{

public static void Main()

{

XmlTextReader myxtreader = new XmlTextReader("booksort.xml");

XmlReader myxreader = myxtreader;

XPathDocument doc = new XPathDocument(myxreader);

XPathNavigator nav = doc.CreateNavigator();

XPathExpression expr;

expr = nav.Compile("descendant::book[author/last-name='Austen']");

//expr.AddSort("title", XmlSortOrder.Ascending, XmlCaseOrder.None, "", XmlDataType.Text);

XPathNodeIterator iterator = nav.Select(expr);

while (iterator.MoveNext())

{

XPathNavigator nav2 = iterator.Current;

nav2.MoveToFirstChild();

Console.WriteLine("Book title: {0}", nav2.Value);

}

}

}

運(yùn)行這個(gè)程序，結(jié)果為：

Book title: Pride And Prejudice

Book title: Emma

Book title: Sense and Sensibility

可以看到查找正確。

利用XPATH中的一些功能，也可以實(shí)現(xiàn)簡單的排序和簡單運(yùn)算。如在數(shù)據(jù)庫中經(jīng)常要對數(shù)據(jù)進(jìn)行匯總，就可用XPATH實(shí)現(xiàn)。